test5_am.c

mpi并行计算的c++代码 可用vc或gcc编译通过 可以用来搭建并行计算试验环境

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h" 
#include "stdio.h"
#include "mpitest.h"

/* tests a series of Gets. Run on 2 processes. */

/* same as test5.c but uses alloc_mem */

#define SIZE 2000

int main(int argc, char *argv[]) 
{ 
/*    int rank, nprocs, i, A[SIZE], B[SIZE]; */
    int rank, nprocs, i, *A, *B;
    MPI_Win win;
    int errs = 0;
 
    MTest_Init(&argc,&argv); 

    MPI_Comm_size(MPI_COMM_WORLD,&nprocs); 
    MPI_Comm_rank(MPI_COMM_WORLD, &rank); 
  
    if (nprocs != 2) {
        printf("Run this program with 2 processes\n");
        MPI_Abort(MPI_COMM_WORLD,1);
    }

    i = MPI_Alloc_mem(SIZE * sizeof(int), MPI_INFO_NULL, &A);
    if (i) {
        printf("Can't allocate memory in test program\n");
        MPI_Abort(MPI_COMM_WORLD, 1);
    }
    i = MPI_Alloc_mem(SIZE * sizeof(int), MPI_INFO_NULL, &B);
    if (i) {
        printf("Can't allocate memory in test program\n");
        MPI_Abort(MPI_COMM_WORLD, 1);
    }
    
    if (rank == 0) {
        for (i=0; i<SIZE; i++)
            B[i] = 500 + i;
        MPI_Win_create(B, SIZE*sizeof(int), sizeof(int), MPI_INFO_NULL, 
                       MPI_COMM_WORLD, &win); 
        MPI_Win_fence(0, win); 
        for (i=0; i<SIZE; i++) {
            A[i] = i+100;
            MPI_Get(&A[i], 1, MPI_INT, 1, i, 1, MPI_INT, win);
        }
        MPI_Win_fence(0, win); 
        for (i=0; i<SIZE; i++)
            if (A[i] != 1000 + i) {
                printf("Rank 0: A[%d] is %d, should be %d\n", i, A[i], 1000+i);
                errs++;
            }
    }

    if (rank == 1) {
        for (i=0; i<SIZE; i++)
            A[i] = 1000 + i;
        MPI_Win_create(A, SIZE*sizeof(int), sizeof(int), MPI_INFO_NULL, 
                   MPI_COMM_WORLD, &win); 
        MPI_Win_fence(0, win); 
        for (i=0; i<SIZE; i++) {
            B[i] = i+200;
            MPI_Get(&B[i], 1, MPI_INT, 0, i, 1, MPI_INT, win);
        }
        MPI_Win_fence(0, win); 
        for (i=0; i<SIZE; i++)
            if (B[i] != 500 + i) {
                printf("Rank 1: B[%d] is %d, should be %d\n", i, B[i], 500+i);
                errs++;
            }
    }

    MPI_Win_free(&win); 

    MPI_Free_mem(A);
    MPI_Free_mem(B);

    MTest_Finalize(errs);
    MPI_Finalize(); 
    return 0; 
}